In a NOT gate realized with a relay coil and a normally closed contact, which statement is true about how the coil current relates to the input?

• A. The NOT operation is achieved by the coil energizing when the input is false.
• B. The NOT operation is achieved by the coil energizing when the input is true.
• C. The NOT operation cannot be implemented with a relay.
• D. The NOT operation is achieved by the coil never energizing.

Answer: (A)